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Home >> Toyota >> 2022 >> RAV4 LE, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Hybrid Battery Control System - Service Information (7 Of 7)) >> HV BATTERY STACK (for LITHIUM-ION BATTERY) >> Discharging [06/2020 - ] >> Procedure

Discharging [06/2020 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. DISCHARGING (WHEN USING THE LI-ION BATTERY DISCHARGER) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    NOTE:

    Make sure to observe the following points when using the Li-ion battery discharger. 

    • Set it in a secure, flat place.
    • Set it in a dry place protected from dust and water.
    • Set it in a position where illumination of the LED indicators can be observed.
    • Do not block the ventilation holes or cooling fans.
    1. Select Li-ion battery connection cables
      1. Confirm the type of the Li-ion battery connection cable as indicated by the tag shown in the illustration. (Type: TM4216-71)
        GTY749742Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Install Li-ion battery connection cable
      1. Set the Li-ion battery discharger as shown in the illustration.
        GTY388483Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Connect the Li-ion battery connection cable connector (A) to the Li-ion battery discharger connector (A).
        NOTE:

        Make sure that the connector is connected securely.

        GTY555009Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Connector (A)
      3. Connect the Li-ion battery connection cable connector (B) to the Li-ion battery discharger connector (B).
        NOTE:

        Make sure that the connector is connected securely.

        GTY578492Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Connector (B)
      4. Set the Li-ion battery discharger as shown in the illustration.

        HINT: 

        The Li-ion battery discharger is set on its side so that the ventilation holes will not be blocked.

        GTY388393Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Connect Li-ion battery connection cable
      1. Connect the connector (orange) of the HV supply stack sub-assembly to be discharged to the Li-ion battery connection cable (orange).
        GTY771198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Li-Ion Battery Connection Cable
        *b HV Supply Stack Sub-assembly Connector
        *c Connection for No. 1 HV Supply Stack Sub-assembly Connector
        *d Connection for No. 2 HV Supply Stack Sub-assembly Connector
      2. Confirm that all of the LED indicators are illuminated as shown in the following table.
        WARNING:

        If all of the LED indicators of the Li-ion battery discharger listed in the following table are not illuminated, the HV supply stack sub-assembly cannot be discharged using the Li-ion battery discharger. Make sure to soak the HV supply stack sub-assembly in a salt water solution to complete discharging.

        LED INDICATOR ILLUMINATION STATUS (WHEN DISCHARGE HAS STARTED NORMALLY)

        Item LED Indicator No. LED Indicator Illumination Status
        No. 1 HV supply stack sub-assembly 1 to 35 Illuminated
        No. 2 HV supply stack sub-assembly 36 to 70 Illuminated
        GTY773145Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Confirm that the cooling fans operate.
        GTY575696Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Cooling Fans - -

        HINT: 

        • To discharge the HV supply stack sub-assembly completely, continue discharging for at least 1 hour after the LED indicators have turned off.
        • Discharge of a fully charged HV supply stack sub-assembly will complete within 5 hours (including 1 hour waiting time after the LED indicators have turned off).
    4. Confirm discharge completion
      1. Confirm that all of the LED indicators of the Li-ion battery discharger have turned off.
      2. Continue to discharge the HV battery for 1 hour after all of the LED indicators of the Li-ion battery discharger have turned off.
    5. Disconnect Li-ion battery connection cable
      1. Disconnect the connector (orange) of the HV supply stack sub-assembly from the Li-ion battery connection cable (orange).
        GTY766439Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Remove Li-ion battery connection cable
      1. Set the Li-ion battery discharger as shown in the illustration.
        GTY388395Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Disconnect the Li-ion battery connection cable connector (B) from the Li-ion battery discharger connector (B).
        GTY582550Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Connector (B)
      3. Disconnect the Li-ion battery connection cable connector (A) from the Li-ion battery discharger connector (A).
        GTY575126Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Connector (A)
  2. DISCHARGING (WHEN USING THE SALT WATER SOLUTION) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    NOTE:
    • When discharging using salt water solution, first add a measured amount of water to the container, and then add the concentrated salt water solution.
    • Calculate the salt water concentration based on the measured volume of water in the container so that a 1% salt water solution will be made after adding the concentrated salt water solution to the water in the container where the HV supply stack sub-assembly is set.
    1. Prepare HV supply stack sub-assembly
      1. Set the HV supply stack sub-assembly in the container (A).
        GTY767311Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Example
        *b Container (A)
    2. Prepare to discharge (Add water to container)
      1. Measure the water capacity of the container (B).
        GTY597759Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Example
        *b Container (B)

        HINT: 

        Water capacity of the container (B) is assumed as X (liter).

      2. Using the container (B), add water to the container (A) until the HV supply stack sub-assembly is completely submerged.
        GTY765102Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Example
        *b Water Surface
        *c Container (A)
        *d Container (B)
        NOTE:

        Make sure to record the times the container (B) was filled with water to add water to the container (A).

      3. Using the following formula, calculate the amount of water added to the container (A).

        Amount of water added to the container (A)

        Y (liter) = Water capacity of the container (B) x Number of times the container (B) was filled with water to submerge the HV supply stack sub-assembly

        HINT: 

        Amount of water added to the container (A) is assumed as Y (liter).

    3. Prepare salt water solution
      1. While measuring the amount of water, fill about half of the container (B) with water.
        GTY555483Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Example
        *b Container (B)

        HINT: 

        Amount of water added to the container (B) is assumed as Z (liter).

      2. Calculate the amount of salt to be added to the container (A) so that a 1% salt water solution will be made.

        Amount of Salt

        Amount of salt (kg) = (Y (liter) + Z (liter)) x 0.01

      3. Add the calculated amount of salt to the container (B) and stir it thoroughly.
        GTY546771Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Example
        *b Container (B)
    4. Add salt water solution
      1. Add the concentrated salt water solution to the container (A).
        GTY610362Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Discharge
      1. Leave the HV supply stack sub-assembly as is for 24 hours or more until discharge is complete.
        WARNING:
        • Do not place a lid on the container.
        • Make sure to leave the HV supply stack sub-assembly and container as is for 24 hours or more.
        • Display a warning sign to inform others that discharge is being performed.
    6. Confirm discharge completion
      1. Check that bubbles are not forming in the container.
        NOTE:

        If bubbles are forming, discharge may not be completed yet. Do not place a lid on the container.

    7. Display a warning sign such as "DO NOT TOUCH! (DISCHARGE BEING PERFORMED) to inform others. Make a copy of the warning sign and place it near the HV supply stack sub-assembly being discharged.
      GTY390230Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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